Question 1

Which of the following species is isoelectronic with $$\mathrm{Se$$^{2-}$$}$$?

Accepted Answer

Kr

Question 2

Given the table below for antimony isotopes, fill in the missing isotopic data:

Isotope: $$^{121}\mathrm{Sb}$$, Isotopic Mass: $$120.9038$$ amu, Abundance: (missing)
Isotope: (missing), Isotopic Mass: (missing), Abundance: $$42.79\%$$

Which of the following correctly completes the table?

Accepted Answer

$$^{121}\mathrm{Sb}$$, abundance = $$57.21\%$$; $$^{123}\mathrm{Sb}$$, mass = $$122.9049$$ amu

Question 3

________ are similar for the elements in the same group of the periodic table.

Accepted Answer

chemical properties

Question 4

For the electron arrangements $$2, 8, 8, 1$$ and $$2, 8, 6$$, identify the symbol for the cation, the symbol for the anion, the formula for the ionic compound they form, and the name of the ionic compound.

Accepted Answer

symbol of the cation: K$$^{+}$$; symbol of the anion: S$$^{2-}$$; formula: K$$_2S$$; name: potassium sulfide

Question 5

A personal floatation device worn by a kid in a pool contains particles that are far apart. What state of matter is present?

Accepted Answer

Gas

Question 6

Identify the set that contains a metal, a nonmetal, and a metalloid in this order.

Accepted Answer

Question 7

Three isotopes of magnesium, with mass numbers of $$24$$, $$25$$, and $$26$$, exist naturally. How are these isotopes similar?

Accepted Answer

The isotopes have the same number of protons.

Question 8

Calculate the molar mass of the following compounds:
(i) $$\mathrm{Co(ClO)_2}
(ii$$) $$\mathrm{N_2S_5}
($$iii) $$\mathrm{Cu($$ClO_3$$)_2}$$
Which set of values is correct?

Accepted Answer

i) $$161.83 g/$$mol, ii) $$188.37 g/$$mol, iii) $$263.78 g/$$mol

Question 9

A yellow solid is exposed to sunlight, resulting in a white metal and an orange gas. Neither the metal nor the gas can be further decomposed by chemical processes. Identify the elements and compounds among the yellow solid, white metal, and orange gas.

Accepted Answer

Element: white metal and orange gas; Compound: yellow solid

Question 10

Which of the following does NOT have a charge of $$-1$$?

Accepted Answer

ammonium only

Question 11

Which of the following statements is true about the number of protons in an atom of Cl and an atom of Mg?

Accepted Answer

An atom of Cl has a greater number of protons than an atom of Mg.

Question 12

Identify the formula of the compounds with the names given below:
carbon tetrachloride, diboron trisulfide, xenon tetrafluoride, iodine monochloride, phosphorus pentasulfide.

Accepted Answer

CCl$$_4$$, B$$_2S$_3$$, XeF$$_4$$, ICl, PS$$_5$$

Question 13

Identify the names of the positive ions involved in each of the following compounds:
A) MgO
B) K$$_2SO$_4
C) $$NaBrO$$_4
D) Co(NO$_3$$)$$_2
E) Mn(OH$$)$$_2$$

Accepted Answer

A) Magnesium ion; B) Potassium ion; C) Sodium ion; D) Cobalt (II) ion; E) Manganese (II) ion

Question 14

Identify the name of the element with an atomic number of $$12. $$Which category does this element belong to?

Accepted Answer

Magnesium, Alkaline Earth

Question 15

A sample contains $$^{121}\mathrm{Sb}$$ with an abundance of $$57.21\%$$ and $$^{123}\mathrm{Sb}$$ with an abundance of $$42.79\%. $$Calculate the average atomic mass of antimony using the following isotopic masses: $$^{121}\mathrm{Sb}$$: $$120.9038$$ amu, $$^{123}\mathrm{Sb}$$: $$122.9049$$ amu.

Accepted Answer

$$121.76$$ amu

Question 16

Which of the following best describes why elements in the same group of the periodic table have similar chemical properties?

Accepted Answer

They have the same number of valence electrons.

Question 17

Which of the following is a polyatomic ion with a charge of $$+1$$?

Accepted Answer

Ammonium ($$\mathrm{NH_4$^+})$$

Question 18

A compound is formed between sodium and phosphate. What is the correct formula for this compound?

Accepted Answer

$$\mathrm{Na_3PO_4}$$

Question 19

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have different numbers of neutrons.

Filling in Missing Isotopic Data for Antimony (Sb)

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